Three-Dimensional Cadmium–Organic Framework with Dual Functions of Oxygen Evolution in Water Splitting and Fenton-like Photocatalytic Removal of Organic Pollutants

Abstract

Metal−organic frameworks (MOFs) have exhibited appreciable potential as catalytic agents in the field of material science. The research of new MOFs with dual functions in electrocatalysis and photocatalysis under ultraviolet (UV) irradiation is extremely pivotal for renewable energy applications. Hence, we synthesized a series of three-dimensional MOFs, namely, [Cd(bimb) , and [Cd(bimb) 4 (ONO 2 ) 2 ] n (Cd-MOF 3) (bimb = 1,4-bis(imidazol-1-ylmethyl)benzene; H 2 ITA = 5hydroxyisophthalic acid), with applicability in the oxygen evolution reaction process and Fenton-like photocatalysis. The obtained results show that Cd-MOF 1 exhibited the most remarkable catalytic performance, affording a current density of 10 mA cm −2 at a very low overpotential of 279 mV and the smallest Tafel slope of 85.13 mV dec −1 . Meanwhile, these MOFs can generate hydroxyl radicals (•OH) under UV light irradiation with the existence of H 2 O 2 , enabling the rapid degradation of organic pollutants. This study provides a valuable direction for producing multifunctional and environmentally friendly catalysts.

Nanoporous Metal/Covalent Organic Framework-Based Electrocatalysts for Water Splitting

“…The synthesis of a series of cadmium-based MOFs such as [Cd­(bimb) 2 (HITA) 2 ] n and [Cd­(bimb) 4 (ONO 2 ) 2 ] n revealed that the former exhibits excellent performance in OER with a lower overpotential of 279 mV and a reduced Tafel slope. In the meantime, when exposed to UV light and H 2 O 2 , these MOFs can produce OH • radicals which accelerate the breakdown of the dyes …”

Copper-Based Two-Dimensional Metal–Organic Frameworks for Fenton-like Photocatalytic Degradation of Methylene Blue under UV and Sunlight Irradiation

“…These materials exhibit excellent characteristics for electrochemical applications because of their large specific surface area, tunable structure, porous network, high availability of metal active sites, and efficient mass-transport properties. , Therefore, they have been applied to various electrochemical processes, such as energy storage, sensing, catalysis, − and electrochemical reactions . The unique properties of these compounds facilitate efficient charge transfer and ion diffusion, thereby enhancing the electrochemical performance …”

CoNi–MOF–Graphene Magnetic Nanocomposites for the Electrocatalytic Detection of Glucose and the Efficient Removal of Organic Dyes

“…14 Wu and co-workers reported a series of three-dimensional (3D) MOFs with excellent oxygen evolution reaction (OER) activity and photocatalytic properties for renewable energy conversion and environmental remediation, which provided a direction for the production of multifunctional environmentally friendly catalysts. 15 Presently, many efforts have been made to modify and enhance the characteristics of single-metal MOFs by combining one or more metals into single-metal MOFs. 16 Compared with single-metal MOFs, bimetallic MOFs exhibit higher catalytic activity due to the generation of new defects within the same framework and the excellent synergistic effect between various metal centers.…”

“…Zhang et al prepared a new polyoxometalate (POM)-encapsulated MOF material by the hydrothermal method, which showed excellent HER activity and dye degradation activity, but it could not be recycled . Wu and co-workers reported a series of three-dimensional (3D) MOFs with excellent oxygen evolution reaction (OER) activity and photocatalytic properties for renewable energy conversion and environmental remediation, which provided a direction for the production of multifunctional environmentally friendly catalysts . Presently, many efforts have been made to modify and enhance the characteristics of single-metal MOFs by combining one or more metals into single-metal MOFs .…”